# Copyright (c) 2010 Advanced Micro Devices, Inc.
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from common import FileSystemConfig
from topologies.BaseTopology import SimpleTopology

from m5.objects import *
from m5.params import *

# Creates a Mesh topology with 4 directories, one at each corner.
# One L1 (and L2, depending on the protocol) are connected to each router.
# XY routing is enforced (using link weights) to guarantee deadlock freedom.


class MeshDirCorners_XY(SimpleTopology):
    description = "MeshDirCorners_XY"

    def __init__(self, controllers):
        self.nodes = controllers

    def makeTopology(self, options, network, IntLink, ExtLink, Router):
        nodes = self.nodes

        num_routers = options.num_cpus
        num_rows = options.mesh_rows

        # default values for link latency and router latency.
        # Can be over-ridden on a per link/router basis
        link_latency = options.link_latency  # used by simple and garnet
        router_latency = options.router_latency  # only used by garnet

        # First determine which nodes are cache cntrls vs. dirs vs. dma
        cache_nodes = []
        dir_nodes = []
        dma_nodes = []
        for node in nodes:
            if (
                node.type == "L1Cache_Controller"
                or node.type == "L2Cache_Controller"
            ):
                cache_nodes.append(node)
            elif node.type == "Directory_Controller":
                dir_nodes.append(node)
            elif node.type == "DMA_Controller":
                dma_nodes.append(node)

        # Obviously the number or rows must be <= the number of routers
        # and evenly divisible.  Also the number of caches must be a
        # multiple of the number of routers and the number of directories
        # must be four.
        assert num_rows > 0 and num_rows <= num_routers
        num_columns = int(num_routers / num_rows)
        assert num_columns * num_rows == num_routers
        caches_per_router, remainder = divmod(len(cache_nodes), num_routers)
        assert remainder == 0
        assert len(dir_nodes) == 4

        # Create the routers in the mesh
        routers = [
            Router(router_id=i, latency=router_latency)
            for i in range(num_routers)
        ]
        network.routers = routers

        # link counter to set unique link ids
        link_count = 0

        # Connect each cache controller to the appropriate router
        ext_links = []
        for i, n in enumerate(cache_nodes):
            cntrl_level, router_id = divmod(i, num_routers)
            assert cntrl_level < caches_per_router
            ext_links.append(
                ExtLink(
                    link_id=link_count,
                    ext_node=n,
                    int_node=routers[router_id],
                    latency=link_latency,
                )
            )
            link_count += 1

        # NUMA Node for each quadrant
        # With odd columns or rows, the nodes will be unequal
        numa_nodes = [[], [], [], []]
        for i in range(num_routers):
            if i % num_columns < num_columns / 2 and i < num_routers / 2:
                numa_nodes[0].append(i)
            elif i % num_columns >= num_columns / 2 and i < num_routers / 2:
                numa_nodes[1].append(i)
            elif i % num_columns < num_columns / 2 and i >= num_routers / 2:
                numa_nodes[2].append(i)
            else:
                numa_nodes[3].append(i)

        num_numa_nodes = 0
        for n in numa_nodes:
            if n:
                num_numa_nodes += 1

        # Connect the dir nodes to the corners.
        ext_links.append(
            ExtLink(
                link_id=link_count,
                ext_node=dir_nodes[0],
                int_node=routers[0],
                latency=link_latency,
            )
        )
        link_count += 1
        ext_links.append(
            ExtLink(
                link_id=link_count,
                ext_node=dir_nodes[1],
                int_node=routers[num_columns - 1],
                latency=link_latency,
            )
        )
        link_count += 1
        ext_links.append(
            ExtLink(
                link_id=link_count,
                ext_node=dir_nodes[2],
                int_node=routers[num_routers - num_columns],
                latency=link_latency,
            )
        )
        link_count += 1
        ext_links.append(
            ExtLink(
                link_id=link_count,
                ext_node=dir_nodes[3],
                int_node=routers[num_routers - 1],
                latency=link_latency,
            )
        )
        link_count += 1

        # Connect the dma nodes to router 0.  These should only be DMA nodes.
        for i, node in enumerate(dma_nodes):
            assert node.type == "DMA_Controller"
            ext_links.append(
                ExtLink(
                    link_id=link_count,
                    ext_node=node,
                    int_node=routers[0],
                    latency=link_latency,
                )
            )

        network.ext_links = ext_links

        # Create the mesh links.
        int_links = []

        # East output to West input links (weight = 1)
        for row in range(num_rows):
            for col in range(num_columns):
                if col + 1 < num_columns:
                    east_out = col + (row * num_columns)
                    west_in = (col + 1) + (row * num_columns)
                    int_links.append(
                        IntLink(
                            link_id=link_count,
                            src_node=routers[east_out],
                            dst_node=routers[west_in],
                            src_outport="East",
                            dst_inport="West",
                            latency=link_latency,
                            weight=1,
                        )
                    )
                    link_count += 1

        # West output to East input links (weight = 1)
        for row in range(num_rows):
            for col in range(num_columns):
                if col + 1 < num_columns:
                    east_in = col + (row * num_columns)
                    west_out = (col + 1) + (row * num_columns)
                    int_links.append(
                        IntLink(
                            link_id=link_count,
                            src_node=routers[west_out],
                            dst_node=routers[east_in],
                            src_outport="West",
                            dst_inport="East",
                            latency=link_latency,
                            weight=1,
                        )
                    )
                    link_count += 1

        # North output to South input links (weight = 2)
        for col in range(num_columns):
            for row in range(num_rows):
                if row + 1 < num_rows:
                    north_out = col + (row * num_columns)
                    south_in = col + ((row + 1) * num_columns)
                    int_links.append(
                        IntLink(
                            link_id=link_count,
                            src_node=routers[north_out],
                            dst_node=routers[south_in],
                            src_outport="North",
                            dst_inport="South",
                            latency=link_latency,
                            weight=2,
                        )
                    )
                    link_count += 1

        # South output to North input links (weight = 2)
        for col in range(num_columns):
            for row in range(num_rows):
                if row + 1 < num_rows:
                    north_in = col + (row * num_columns)
                    south_out = col + ((row + 1) * num_columns)
                    int_links.append(
                        IntLink(
                            link_id=link_count,
                            src_node=routers[south_out],
                            dst_node=routers[north_in],
                            src_outport="South",
                            dst_inport="North",
                            latency=link_latency,
                            weight=2,
                        )
                    )
                    link_count += 1

        network.int_links = int_links

    # Register nodes with filesystem
    def registerTopology(self, options):
        i = 0
        for n in numa_nodes:
            if n:
                FileSystemConfig.register_node(
                    n, MemorySize(options.mem_size) // num_numa_nodes, i
                )
            i += 1
